Boiling Glass

04/17/10 - Boiled Glass - Boiled glass, also called boiling glass is one of the high fire procedures preformed inside a kiln. Unlike the manner that water boils, glass when heated up to a extremely high temperature will bubble. This process is caused by the elements losing its composure and vaporizing. This method was one of Klaus Moje's processes.

The TechNotes #4 by Bullseye gives us the best information about this procedure. It is called "Heat and Glass" and describes what transpires as glass is heated up. In the area of around 1600-1700 degrees Fahrenheit this bubbling process appears. As the glass is continued to be heated, the rising bubbles hit the surface of the glass and pop. Glass when heated at advanced temperatures goes through chemical changes and becomes more molten. As these bubbles rise to the top surface, they pull up colors from all the layers along with the bubbles.

The amount and placement of these bubbles is very unpredictable. Try using some bubble powder or stacking glass to trap air to achieve the same appearance.